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9=8+3a-8
We move all terms to the left:
9-(8+3a-8)=0
We add all the numbers together, and all the variables
-(+3a)+9=0
We get rid of parentheses
-3a+9=0
We move all terms containing a to the left, all other terms to the right
-3a=-9
a=-9/-3
a=+3
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